- Albertus de Fontanella1
- Albigenses1
- Alchemy--Bibliography1
- Aldobrandini, Giovanni degli1
- Alessandri, Alessandro degli1
- Alessandri, Niccolò degli1
- Alessandro, Pietro di1
- Alexius, Saint1
- Alfonso V, King of Aragon, 1396-14581
- Alfīyat al-ʻIrāqī (ʻIrāqī, ʻAbd al-Raḥīm ibn al-Ḥusayn)1
- Allegories1
- Allegory1
- Almagest (Ptolemy)1
- Almanach perpetuum celestium motuum (Zacuto, Abraham ben Samuel)1
- Almanacs1
- Altoviti, Bartolomea1
- Alum tawed bindings1
- Amadori, Lorenzo1
- Ambrogio, Leonardo d'1
- Ambrose, Saint, Bishop of Milan, -3971